<!--
 * @Author: coman
 * @LastEditors: coman
 * @Date: 2020-06-10 12:08:21
 * @motto: No pain,No gain
 * @LastEditTime: 2020-06-10 12:09:28
--> 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
      var sum = 0;
      for(var i=1;i<=100;i++){
        if(i%2==0){
          sum+=i;
        }
      }
      console.log("100内的偶数和为:"+sum);
    </script>
</body>
</html>